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首页> 美国卫生研究院文献>Polymers >Effects of Freeze–Thaw Thermal Cycles on the Mechanical Degradation of the Gas Diffusion Layer in Polymer Electrolyte Membrane Fuel Cells
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Effects of Freeze–Thaw Thermal Cycles on the Mechanical Degradation of the Gas Diffusion Layer in Polymer Electrolyte Membrane Fuel Cells

机译：冻融热循环对聚合物电解质膜燃料电池气体扩散层机械降解的影响

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摘要

In this paper, the mechanical degradation of a commercial gas diffusion layer subjected to repeated freeze–thaw thermal cycles is studied. In a fuel cell, the mechanical assembly state directly affects the performance of polymer electrolyte membrane fuel cells. Particularly, the gas diffusion layer repeatedly withstands the complex heat and humidity environmental conditions in which the temperature and humidity are always greatly changed. Studying the three-dimensional mechanical degradation of gas diffusion layers due to orthotropic properties is very useful in extending the lifetime and durability of fuel cells. To investigate this, we first established the standard freeze–thaw thermal cycle and studied the gas diffusion layer’s mechanical degradation performance with up to 400 repeated freeze–thaw thermal cycles. Furthermore, different types of failure in the gas diffusion layer caused by the repeated thermal aging treatment were observed using a scanning electron microscope, to explain the change in the mechanical deterioration. As a result, the different thermal failure plays different roles in the explanation of the gas diffusion layer’s mechanical degradation under different thermal cycles. In particular, the thermal failure that resulted from the first 100 thermal cycles has the greatest effect on the compressive and tensile performance, compared to the shear behavior.
机译：在本文中，研究了商业气体扩散层在反复冻融热循环下的机械降解。在燃料电池中，机械组装状态直接影响聚合物电解质膜燃料电池的性能。特别地，气体扩散层反复经受温度和湿度总是很大变化的复杂的热和湿度环境条件。研究由于正交异性导致的气体扩散层的三维机械降解对于延长燃料电池的寿命和耐用性非常有用。为了对此进行研究，我们首先建立了标准的冻融热循环，并研究了气体扩散层在进行多达400次重复的冻融热循环后的机械降解性能。此外，使用扫描电子显微镜观察到由重复的热老化处理引起的气体扩散层中的不同类型的破坏，以解释机械劣化的变化。结果，不同的热失效在解释气体扩散层在不同的热循环下的机械性能下降中起着不同的作用。特别是与剪切行为相比，前100个热循环导致的热破坏对压缩和拉伸性能的影响最大。

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